Most modern cell phones come with built in GPS receivers, but not all do. If yours doesn't you're missing out on a lot of the best features of the mapping software in your phone. Since almost all phones have a Bluetooth connection, you can easily connect a Bluetooth GPS receiver. A Bluetooth GPS receiver will allow you to keep a connection to GPS satellites so that you'll always know where you are. These devices are very small and easy to carry around. Take a look at some Bluetooth GPS receivers, and think how much easier life would be if you always know where you are.